Electric-arc lamp.



No. 880,435. PATENTED FEB, 25, 1908.

. T. E. ADAMS.

memo ARC LAMP.

APPLIOATIOK 11.31) A UG. 11 1905.

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[TNESSES PATENTED FEB. 25, 1908.

T. E. ADAMS. ELECTRIC ARC L'AMP. APPLICATION FILED AUG. 11. 1905.

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Attorney THOMAS EDGAR ADAMS, OF CLEVELAND, OHIO.

ELECTRIC-ARC LAMP.

Specification of Letters Patent.

Patented Feb. 25, 1908.

Application filed August 11. 1905. Serial No. 273.813.

To all whom it may concern:

Be it known that I, THOMAS EDGARADAMS, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Electric-Arc Lamps; and I do hereby declare the following to be a full, clear, and eXact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in electric arc lamps and more particularly to a novel construction of cap or coverfor the arc-inclosing globe,-*an object of the invention being to provide simple and efficient means for prolonging the life of the carbons.

A further object is to improve and simplify the construction of the cover for the arc-inclosing globe and at the same time provide a series of gas chambers having such relation to the globe, to the outer air and to each other, as to form a reservoir which will receive gas from and subsequently discharge a portion of it into the globe.

A further object is to construct the inner globe cap or cover in such manner that the guide for the upper carbon shall be located etween the top and bottom walls of a gas chamber within said cap or cover and the opening in said top and bottom walls of appreciably greater diameter than that of the carbon to insure the free passage of the carbon through them should alinement of the carbons be incorrect.

A further object is to construct the device in such manner that it can be permanently secured to the lamp frame and so that the carbon guide disk can be made separate and be permitted to have slight lateral play to accommodate itself to inequalities of carbons.

With these objects in view, the invention consists in certain novel features of construction and combinations and arrangements of parts as hereinafter set forth and pointed out in the claim.

In the accompanying drawings: Fi ure 1 is a sectional view of a portion of an e lectric arc lamp showing the a plication of my improvements thereto. ig. 2 is a sectional view of my improved globe cover Fig. 3 is a top lan view. Fig. 4 is a bottom plan view of t e same. Fig. 5 is a plan view of the top of the cover. Fig. 6 is a side view of the same. Figs. 7 and 8 are plan and edge views res ectively of the guide disk.

he depending posts of a lamp frame are represented at 1, 2, and to the lower ends of these posts my improved arc-inclosing globe cover or cap 3 is secured. I prefer to make the cover of porcelain, although other material may be employed if desired. The body portion 4 of the cover is made of considerable depth and is hollow or dished to form a chamber 5 which, when the cover is in place on the globe 6, depends within the same as shown in Fig. 1.

The chambered body 4 of the cover is made at its upper portion with a peripheral flange 7 which overhangs the mouth of the globe and said flange is provided on its bottom face with a shallow rib or enlargement 8 which seats upon the edge of the globes month. At one side, a notched lug 9 projects from the flange 7 and rests against the bottom of post 1, to which it is secured by a screw 10. At the opposite side of the cover, a larger lug 11 is provided, and through this lug, two holes 12, 13 are made. This lug rests against the lower end of the post 2 and is secured thereto by a screw 14 passing upwardly through the hole 13. The hole 12 is for the accommodation of the hanger 15 which carries the lower carbon holder 16 within the globe 6. A wire bail 17 embraces the globe 6 and is attached at its upper end to the screws 1014. A spring 18 carried by the lower end of this bail, serves to sustain the globe and press it upwardly against its seat 8.

The bottom wall 19 of the chambered cover 8 is preferably dished, as at 20 and is made with a hole 2]. communicating with the dished portion 20. The cover 3 is provided with a top plate 22 seated in an annular recess 28 in the cover and closing the top of the chamber 5 therein. The top plate 22 is made with a hole 24 which alines with the hole 21 in the bottom 19 of the cover, for the passage of the upper carbon. These holes 21 and 24 are appreciably greater in diameter than the diameter of the carbon rod, so as to constitute free passages between the chamber 5 and the outer air and between said chamber and the interior of the arc-inclosing globe. The said openings in the top and bottom of the cover are not, therefore, intended to guide the carbon, but merely to permit the passage of the latter through the cover, and serve as passageways as above. explained. The carbon rod is guided in its movements through the cover, by means of a disk 25 located within the chamber 5. The guide disk 25 is made with a series of peripheral notches 26, and rests upon a shoulder 27 within the chamber 5, said shoulder being so located that the disk will be disposed between the top and bottom walls thereof, and removed from both. A hole 29 is made in the disk 25 for the passage of the carbon and is of such size as to fit the carbon closely, while the diameter of the guide disk is slightly less than that of the chamber, so that said disk can have slight lateral play to compensate for inequalities of the carbon.

From the construction and arrangement of parts above described, it will be observed that the chamber within the cover is divided by the guide disk into two communicating compartments.

The chamber 5 constitutes a gas reservoir and the currents of gas within said reservoir will be compelled by the notched guide disk to follow numerous circuitous routes. Gas generated within the arc inclosure will overflow the same and find its way into the lower compartment of the chamber 5 through the carbon passage 21 in the bottom wall of the cover. As the gas accumulates in this lower compartment, it will be compelled to flow radially, pass in numerous streams through the openings formed by the notches in the guide disk, and enter the upper compartment of said chamber. This upper compartment is open to the outer air through the carbon passage 2l and air will attempt to enter through said hole.

During the feeding of the carbons, the rise and fall of the upper carbon will operate to cause the gas to enter the chamber in the cover from the arc-inclosure and to pass from said chamber to the arc-inclosure. Thus the movements of the carbons will cause the lamp to effect a breathing action between the arc-inclosure, and the gas chamber or reservoir in its cover.

By making the carbon guide as a separate part, it can be readily altered, if necessary, to make it fit the carbon rod closely, and the lateral lay which said guide disk is permitted to rave will prevent any binding of the carbon as it passes through the cover, the carbon passages in the top and bottom of the cover being sufficiently large to permit slight lateral play of the carbon without binding. Thus the guide for the carbon in the cover consists of a small disk carried by the cover, the upper portion of the carbon being loosely guided in the carbon tube in the lamp frame and the cover can be sufficiently heavy to insure its stability and safety against injury, and it can be rigidly secured to and made a permanent part of the lamp structure.

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is

1. A cover for an arc-inclosing globe, having a chamber therein provided in its top and bottom with carbon passages, a carbon guide supported within the gas chamber above the bottom thereof and dividing said chamber into superposed compartments, said carbon guide provided in its peripheral portion with notches cooperating with the wall of the gas chamber to form uninterrupted passages connecting the superposed compartments, said guide having an opening for the passage of the carbon.

2. A cover for an arc-inclosing globe, having a gas chamber provided in its top and bottom with carbon passages, the wall of said chamber having a shoulder located intermediate of the top and bottom thereof, a disk constituting a carbon guide supported upon said shoulder, said disk having an opening for the carbon which is smaller than the carbon passages in the top and bottom of the gas chamber, and said disk also having a series of peripheral notches forming uninterrupted passages connecting the portions of the gas chamber above and below said disk.

3. A cover for an arc-inclosing globe, having a gas chamber provided in its bottom with a carbon passage, the wall of said chamber having two shoulders spaced a art, a plate resting upon the upper shouh er and having a carbon passage, a disk disposed within the chamber and resting upon the lower shoulder therein, said disk having peripheral notches forming passages connecting the portion of the chamber above the disk with the portion of the chamber below the disk, and said disk having a carbon passage which is smaller than the first-mentioned carbon passages.

In testimony whereof, I have signed this specification in the presence of two subscribmg wltnesses.

, THOMAS EDGAR ADAMS. l Vitnesses:

J. H. Worms, F. W. SINRAIN. 

